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Zennon spent a majority of his time encased in a thick purple flame, shrouding much of his appearance. However, it is apparent that he had large bat-like wings and two long horns on the sides of his head, with yellow eyes detailed with red veins, making him look slightly like Dante from Demon Lord Dante. In the rare occurrence that Zennon shows his true form he closely resembled his incarnation from the manga having light purple colored fur, three large twisted ugly faces with large yellow eyes, and a pair of long horns on the center head. On his chest he had two other faces each just as demonic as the other.

Zennon was the all powerful leader of the Demon Tribe in the Ice Kingdom. He planned to wipe out a majority of humanity, keeping some alive as slaves. He called fourth his three bodyguards: Daruni, Rerasu and Devilman. He commands them to fight to the death so the victor could gain ownership into the body of the recently deceased Akira Fudo. Devilman wins and is sent to begin the reign of chaos; however he instantly falls in love with the human girl Miki Makimura and drops his plans.

When the demon scout Henka attacks Miki, Devilman fights and kills him. But this was only the first of many demons that Devilman would have to fight in order to protect humanity as Zennon would constantly summon more of his subjects to try and defeat Devilman as he continued with his fiendish plans.

At the end of the anime, Zennon remains undefeated with an army of demons still at his disposal.